TRACK

TM 5-2410-237-23

TRACK THEORY OF OPERATION - CONTINUED

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TRACK - CONTINUED

The seal ring gives a positive seal between the bushing and the link counterbore. The edge of the seal ring is against the

end of the bushing. The thrust rings (15 and 16) are installed on the pin (17). The thrust rings give a specific amount of

compression to the seal assemblies and control the end play (free movement) of the joint. The arrangement of the seal

assemblies and thrust rings keeps foreign materials out of the joint and oil in the joint.

The pin (17) has a hole (18) almost the full length of the pin. Hole (19) is drilled radially in the pin near the center of the

pin. The radial hole (19) lets oil go to the surface between the pin (17) and the bushing (14) and to the lip of the seal

rings. The oil gives lubrication to the pin and bushing and also makes the lip of the seal ring wet. The lip of the seal ring

must be kept wet to prevent wear of the lip of the seal ring. Oil is kept in the pin by a stopper (20) and a plug (21). The

oil is installed in the pin through a hole in the center of the stopper (20). When the chambers in the pin are filled, the

plug (21) is installed in the stopper (20).

Each pin and bushing assembly is sealed and has its own lubrication; the result is no internal wear on the joint. The

interval for the turning of the track pins and bushings is much longer because the only wear will be on the outside of the

bushings and the links.

The two-piece master links (22) and master shoe (23) are held together with capscrews (24).

END OF WORK PACKAGE

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